Enhancement of electrochemical performance of lithium iron phosphate by controlled sol–gel synthesis |
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Authors: | Jae-Kwang Kim Jae-Won Choi Ghanshyam S Chauhan Jou-Hyeon Ahn Gil-Chan Hwang Jin-Beom Choi Hyo-Jun Ahn |
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Affiliation: | aDepartment of Chemical and Biological Engineering and Engineering Research Institute, Gyeongsang National University, 900 Gajwa-dong, Jinju 660-701, Republic of Korea;bDepartment of Earth and Environmental Science, Gyeongsang National University, 900 Gajwa-dong, Jinju 660-701, Republic of Korea;cSchool of Nano and Advanced Materials Engineering and Engineering Research Institute, Gyeongsang National University, 900 Gajwa-dong, Jinju 660-701, Republic of Korea |
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Abstract: | The porous phase pure lithium iron phosphate (LiFePO4/C) composite particles with a few nanometers thick layer of carbon were synthesized by sol–gel method. The in situ coating of carbon on the LiFePO4 particles was achieved by the pyrolysis of carbon source during the thermal treatment. The synthetic conditions were observed to affect physical, morphological and electrochemical properties of the composites. The composite synthesized via a single-step thermal treatment at 700 °C in the presence of a mixture of citric acid and sucrose possesses a large surface area and porous structure. The structure of the residual carbon coated in this sample is observed to be graphene-rich with the lowest D/G (disordered/graphene) ratio in the Raman spectra. When the three LiFePO4/C composites were evaluated as cathode materials in lithium cells at room temperature, the composite prepared in the presence of sucrose as an additional carbon source showed the highest electrochemical performance exhibiting high discharge capacities of 153 (corresponding to 90% of the theoretical capacity), 120, 112, and 94 mAh/g at 0.1, 1, 3, and 5 C-rates, respectively. |
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Keywords: | Cathode material Lithium iron phosphate Sol– gel method Carbon coating Electrochemical performance |
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